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<title>class Gem::SpecFetcher - rubygems: Ruby Standard Library Documentation</title>


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<!-- Method Quickref -->
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  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-c-fetcher">::fetcher</a>
    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-i-available_specs">#available_specs</a>
    <li ><a href="#method-i-detect">#detect</a>
    <li ><a href="#method-i-search_for_dependency">#search_for_dependency</a>
    <li ><a href="#method-i-spec_for_dependency">#spec_for_dependency</a>
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    <main role="main" aria-labelledby="class-Gem::SpecFetcher">
    <h1 id="class-Gem::SpecFetcher" class="class">
      class Gem::SpecFetcher
    </h1>

    <section class="description">
    
<p><a href="SpecFetcher.html"><code>SpecFetcher</code></a> handles metadata updates from remote gem repositories.</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">





                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-fetcher" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">fetcher</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Default fetcher instance.  Use this instead of <a href="SpecFetcher.html#method-c-new"><code>::new</code></a> to reduce object allocation.</p>

                              <div class="method-source-code" id="fetcher-source">
            <pre><span class="ruby-comment"># File rubygems/spec_fetcher.rb, line 42</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">fetcher</span>
  <span class="ruby-ivar">@fetcher</span> <span class="ruby-operator">||=</span> <span class="ruby-identifier">new</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(sources = nil)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Creates a new <a href="SpecFetcher.html"><code>SpecFetcher</code></a>.  Ordinarily you want to use the default fetcher from <a href="SpecFetcher.html#method-c-fetcher"><code>Gem::SpecFetcher::fetcher</code></a> which uses the <a href="../Gem.html#method-c-sources"><code>Gem.sources</code></a>.</p>

<p>If you need to retrieve specifications from a different <code>source</code>, you can send it as an argument.</p>

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File rubygems/spec_fetcher.rb, line 57</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">sources</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-ivar">@sources</span> = <span class="ruby-identifier">sources</span> <span class="ruby-operator">||</span> <span class="ruby-constant">Gem</span>.<span class="ruby-identifier">sources</span>

  <span class="ruby-ivar">@update_cache</span> =
    <span class="ruby-keyword">begin</span>
      <span class="ruby-constant">File</span>.<span class="ruby-identifier">stat</span>(<span class="ruby-constant">Gem</span>.<span class="ruby-identifier">user_home</span>).<span class="ruby-identifier">uid</span> <span class="ruby-operator">==</span> <span class="ruby-constant">Process</span>.<span class="ruby-identifier">uid</span>
    <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Errno</span><span class="ruby-operator">::</span><span class="ruby-constant">EACCES</span>, <span class="ruby-constant">Errno</span><span class="ruby-operator">::</span><span class="ruby-constant">ENOENT</span>
      <span class="ruby-keyword">false</span>
    <span class="ruby-keyword">end</span>

  <span class="ruby-ivar">@specs</span> = {}
  <span class="ruby-ivar">@latest_specs</span> = {}
  <span class="ruby-ivar">@prerelease_specs</span> = {}

  <span class="ruby-ivar">@caches</span> = {
    <span class="ruby-value">:latest</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-ivar">@latest_specs</span>,
    <span class="ruby-value">:prerelease</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-ivar">@prerelease_specs</span>,
    <span class="ruby-value">:released</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-ivar">@specs</span>,
  }

  <span class="ruby-ivar">@fetcher</span> = <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">RemoteFetcher</span>.<span class="ruby-identifier">fetcher</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-available_specs" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">available_specs</span><span
                                class="method-args">(type)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Returns a list of gems available for each source in <a href="../Gem.html#method-c-sources"><code>Gem::sources</code></a>.</p>

<p><code>type</code> can be one of 3 values: :released   =&gt; Return the list of all released specs :complete   =&gt; Return the list of all specs :latest     =&gt; Return the list of only the highest version of each gem :prerelease =&gt; Return the list of all prerelease only specs</p>

                              <div class="method-source-code" id="available_specs-source">
            <pre><span class="ruby-comment"># File rubygems/spec_fetcher.rb, line 211</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">available_specs</span>(<span class="ruby-identifier">type</span>)
  <span class="ruby-identifier">errors</span> = []
  <span class="ruby-identifier">list</span> = {}

  <span class="ruby-ivar">@sources</span>.<span class="ruby-identifier">each_source</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">source</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">names</span> = <span class="ruby-keyword">case</span> <span class="ruby-identifier">type</span>
            <span class="ruby-keyword">when</span> <span class="ruby-value">:latest</span>
              <span class="ruby-identifier">tuples_for</span> <span class="ruby-identifier">source</span>, <span class="ruby-value">:latest</span>
            <span class="ruby-keyword">when</span> <span class="ruby-value">:released</span>
              <span class="ruby-identifier">tuples_for</span> <span class="ruby-identifier">source</span>, <span class="ruby-value">:released</span>
            <span class="ruby-keyword">when</span> <span class="ruby-value">:complete</span>
              <span class="ruby-identifier">names</span> =
                <span class="ruby-identifier">tuples_for</span>(<span class="ruby-identifier">source</span>, <span class="ruby-value">:prerelease</span>, <span class="ruby-keyword">true</span>) <span class="ruby-operator">+</span>
                <span class="ruby-identifier">tuples_for</span>(<span class="ruby-identifier">source</span>, <span class="ruby-value">:released</span>)

              <span class="ruby-identifier">names</span>.<span class="ruby-identifier">sort</span>
            <span class="ruby-keyword">when</span> <span class="ruby-value">:abs_latest</span>
              <span class="ruby-identifier">names</span> =
                <span class="ruby-identifier">tuples_for</span>(<span class="ruby-identifier">source</span>, <span class="ruby-value">:prerelease</span>, <span class="ruby-keyword">true</span>) <span class="ruby-operator">+</span>
                <span class="ruby-identifier">tuples_for</span>(<span class="ruby-identifier">source</span>, <span class="ruby-value">:latest</span>)

              <span class="ruby-identifier">names</span>.<span class="ruby-identifier">sort</span>
            <span class="ruby-keyword">when</span> <span class="ruby-value">:prerelease</span>
              <span class="ruby-identifier">tuples_for</span>(<span class="ruby-identifier">source</span>, <span class="ruby-value">:prerelease</span>)
            <span class="ruby-keyword">else</span>
              <span class="ruby-identifier">raise</span> <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Exception</span>, <span class="ruby-node">&quot;Unknown type - :#{type}&quot;</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">RemoteFetcher</span><span class="ruby-operator">::</span><span class="ruby-constant">FetchError</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">e</span>
    <span class="ruby-identifier">errors</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">SourceFetchProblem</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">source</span>, <span class="ruby-identifier">e</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">list</span>[<span class="ruby-identifier">source</span>] = <span class="ruby-identifier">names</span>
  <span class="ruby-keyword">end</span>

  [<span class="ruby-identifier">list</span>, <span class="ruby-identifier">errors</span>]
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-detect" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">detect</span><span
                                class="method-args">(type=:complete) { |tup| ... }</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Return all gem name tuples who’s names match <code>obj</code></p>

                              <div class="method-source-code" id="detect-source">
            <pre><span class="ruby-comment"># File rubygems/spec_fetcher.rb, line 133</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">detect</span>(<span class="ruby-identifier">type</span>=<span class="ruby-value">:complete</span>)
  <span class="ruby-identifier">tuples</span> = []

  <span class="ruby-identifier">list</span>, <span class="ruby-identifier">_</span> = <span class="ruby-identifier">available_specs</span>(<span class="ruby-identifier">type</span>)
  <span class="ruby-identifier">list</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">source</span>, <span class="ruby-identifier">specs</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">specs</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">tup</span><span class="ruby-operator">|</span>
      <span class="ruby-keyword">if</span> <span class="ruby-keyword">yield</span>(<span class="ruby-identifier">tup</span>)
        <span class="ruby-identifier">tuples</span> <span class="ruby-operator">&lt;&lt;</span> [<span class="ruby-identifier">tup</span>, <span class="ruby-identifier">source</span>]
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">tuples</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-search_for_dependency" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">search_for_dependency</span><span
                                class="method-args">(dependency, matching_platform=true)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Find and fetch gem name tuples that match <code>dependency</code>.</p>

<p>If <code>matching_platform</code> is false, gems for all platforms are returned.</p>

                              <div class="method-source-code" id="search_for_dependency-source">
            <pre><span class="ruby-comment"># File rubygems/spec_fetcher.rb, line 86</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">search_for_dependency</span>(<span class="ruby-identifier">dependency</span>, <span class="ruby-identifier">matching_platform</span>=<span class="ruby-keyword">true</span>)
  <span class="ruby-identifier">found</span> = {}

  <span class="ruby-identifier">rejected_specs</span> = {}

  <span class="ruby-identifier">list</span>, <span class="ruby-identifier">errors</span> = <span class="ruby-identifier">available_specs</span>(<span class="ruby-identifier">dependency</span>.<span class="ruby-identifier">identity</span>)

  <span class="ruby-identifier">list</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">source</span>, <span class="ruby-identifier">specs</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">dependency</span>.<span class="ruby-identifier">name</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">String</span>) <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">specs</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:bsearch</span>)
      <span class="ruby-identifier">start_index</span> = (<span class="ruby-value">0</span><span class="ruby-operator">...</span><span class="ruby-identifier">specs</span>.<span class="ruby-identifier">length</span>).<span class="ruby-identifier">bsearch</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-identifier">specs</span>[<span class="ruby-identifier">i</span>].<span class="ruby-identifier">name</span> <span class="ruby-operator">&gt;=</span> <span class="ruby-identifier">dependency</span>.<span class="ruby-identifier">name</span> }
      <span class="ruby-identifier">end_index</span>   = (<span class="ruby-value">0</span><span class="ruby-operator">...</span><span class="ruby-identifier">specs</span>.<span class="ruby-identifier">length</span>).<span class="ruby-identifier">bsearch</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-identifier">specs</span>[<span class="ruby-identifier">i</span>].<span class="ruby-identifier">name</span> <span class="ruby-operator">&gt;</span> <span class="ruby-identifier">dependency</span>.<span class="ruby-identifier">name</span> }
      <span class="ruby-identifier">specs</span> = <span class="ruby-identifier">specs</span>[<span class="ruby-identifier">start_index</span><span class="ruby-operator">...</span><span class="ruby-identifier">end_index</span>] <span class="ruby-keyword">if</span> <span class="ruby-identifier">start_index</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">end_index</span>
    <span class="ruby-keyword">end</span>

    <span class="ruby-identifier">found</span>[<span class="ruby-identifier">source</span>] = <span class="ruby-identifier">specs</span>.<span class="ruby-identifier">select</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">tup</span><span class="ruby-operator">|</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">dependency</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-identifier">tup</span>)
        <span class="ruby-keyword">if</span> <span class="ruby-identifier">matching_platform</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-operator">!</span><span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">Platform</span>.<span class="ruby-identifier">match_gem?</span>(<span class="ruby-identifier">tup</span>.<span class="ruby-identifier">platform</span>, <span class="ruby-identifier">tup</span>.<span class="ruby-identifier">name</span>)
          <span class="ruby-identifier">pm</span> = (
            <span class="ruby-identifier">rejected_specs</span>[<span class="ruby-identifier">dependency</span>] <span class="ruby-operator">||=</span> \
              <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">PlatformMismatch</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">tup</span>.<span class="ruby-identifier">name</span>, <span class="ruby-identifier">tup</span>.<span class="ruby-identifier">version</span>))
          <span class="ruby-identifier">pm</span>.<span class="ruby-identifier">add_platform</span> <span class="ruby-identifier">tup</span>.<span class="ruby-identifier">platform</span>
          <span class="ruby-keyword">false</span>
        <span class="ruby-keyword">else</span>
          <span class="ruby-keyword">true</span>
        <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">errors</span> <span class="ruby-operator">+=</span> <span class="ruby-identifier">rejected_specs</span>.<span class="ruby-identifier">values</span>

  <span class="ruby-identifier">tuples</span> = []

  <span class="ruby-identifier">found</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">source</span>, <span class="ruby-identifier">specs</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">specs</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">s</span><span class="ruby-operator">|</span>
      <span class="ruby-identifier">tuples</span> <span class="ruby-operator">&lt;&lt;</span> [<span class="ruby-identifier">s</span>, <span class="ruby-identifier">source</span>]
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">tuples</span> = <span class="ruby-identifier">tuples</span>.<span class="ruby-identifier">sort_by</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">x</span><span class="ruby-operator">|</span> <span class="ruby-identifier">x</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">version</span> }

  [<span class="ruby-identifier">tuples</span>, <span class="ruby-identifier">errors</span>]
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spec_for_dependency" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spec_for_dependency</span><span
                                class="method-args">(dependency, matching_platform=true)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Find and fetch specs that match <code>dependency</code>.</p>

<p>If <code>matching_platform</code> is false, gems for all platforms are returned.</p>

                              <div class="method-source-code" id="spec_for_dependency-source">
            <pre><span class="ruby-comment"># File rubygems/spec_fetcher.rb, line 153</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spec_for_dependency</span>(<span class="ruby-identifier">dependency</span>, <span class="ruby-identifier">matching_platform</span>=<span class="ruby-keyword">true</span>)
  <span class="ruby-identifier">tuples</span>, <span class="ruby-identifier">errors</span> = <span class="ruby-identifier">search_for_dependency</span>(<span class="ruby-identifier">dependency</span>, <span class="ruby-identifier">matching_platform</span>)

  <span class="ruby-identifier">specs</span> = []
  <span class="ruby-identifier">tuples</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">tup</span>, <span class="ruby-identifier">source</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">spec</span> = <span class="ruby-identifier">source</span>.<span class="ruby-identifier">fetch_spec</span>(<span class="ruby-identifier">tup</span>)
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">RemoteFetcher</span><span class="ruby-operator">::</span><span class="ruby-constant">FetchError</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">e</span>
    <span class="ruby-identifier">errors</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-constant">Gem</span><span class="ruby-operator">::</span><span class="ruby-constant">SourceFetchProblem</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">source</span>, <span class="ruby-identifier">e</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">specs</span> <span class="ruby-operator">&lt;&lt;</span> [<span class="ruby-identifier">spec</span>, <span class="ruby-identifier">source</span>]
  <span class="ruby-keyword">end</span>

  [<span class="ruby-identifier">specs</span>, <span class="ruby-identifier">errors</span>]
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-suggest_gems_from_name" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">suggest_gems_from_name</span><span
                                class="method-args">(gem_name, type = :latest, num_results = 5)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Suggests gems based on the supplied <code>gem_name</code>. Returns an array of alternative gem names.</p>

                              <div class="method-source-code" id="suggest_gems_from_name-source">
            <pre><span class="ruby-comment"># File rubygems/spec_fetcher.rb, line 172</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">suggest_gems_from_name</span>(<span class="ruby-identifier">gem_name</span>, <span class="ruby-identifier">type</span> = <span class="ruby-value">:latest</span>, <span class="ruby-identifier">num_results</span> = <span class="ruby-value">5</span>)
  <span class="ruby-identifier">gem_name</span>        = <span class="ruby-identifier">gem_name</span>.<span class="ruby-identifier">downcase</span>.<span class="ruby-identifier">tr</span>(<span class="ruby-string">&quot;_-&quot;</span>, <span class="ruby-string">&quot;&quot;</span>)
  <span class="ruby-identifier">max</span>             = <span class="ruby-identifier">gem_name</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">/</span> <span class="ruby-value">2</span>
  <span class="ruby-identifier">names</span>           = <span class="ruby-identifier">available_specs</span>(<span class="ruby-identifier">type</span>).<span class="ruby-identifier">first</span>.<span class="ruby-identifier">values</span>.<span class="ruby-identifier">flatten</span>(<span class="ruby-value">1</span>)

  <span class="ruby-identifier">matches</span> = <span class="ruby-identifier">names</span>.<span class="ruby-identifier">map</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">n</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">next</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">n</span>.<span class="ruby-identifier">match_platform?</span>
    [<span class="ruby-identifier">n</span>.<span class="ruby-identifier">name</span>, <span class="ruby-value">0</span>] <span class="ruby-keyword">if</span> <span class="ruby-identifier">n</span>.<span class="ruby-identifier">name</span>.<span class="ruby-identifier">downcase</span>.<span class="ruby-identifier">tr</span>(<span class="ruby-string">&quot;_-&quot;</span>, <span class="ruby-string">&quot;&quot;</span>).<span class="ruby-identifier">include?</span>(<span class="ruby-identifier">gem_name</span>)
  <span class="ruby-keyword">end</span>.<span class="ruby-identifier">compact</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">matches</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">num_results</span>
    <span class="ruby-identifier">matches</span> <span class="ruby-operator">+=</span> <span class="ruby-identifier">names</span>.<span class="ruby-identifier">map</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">n</span><span class="ruby-operator">|</span>
      <span class="ruby-keyword">next</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">n</span>.<span class="ruby-identifier">match_platform?</span>
      <span class="ruby-identifier">distance</span> = <span class="ruby-identifier">levenshtein_distance</span> <span class="ruby-identifier">gem_name</span>, <span class="ruby-identifier">n</span>.<span class="ruby-identifier">name</span>.<span class="ruby-identifier">downcase</span>.<span class="ruby-identifier">tr</span>(<span class="ruby-string">&quot;_-&quot;</span>, <span class="ruby-string">&quot;&quot;</span>)
      <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">distance</span> <span class="ruby-operator">&gt;=</span> <span class="ruby-identifier">max</span>
      <span class="ruby-keyword">return</span> [<span class="ruby-identifier">n</span>.<span class="ruby-identifier">name</span>] <span class="ruby-keyword">if</span> <span class="ruby-identifier">distance</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
      [<span class="ruby-identifier">n</span>.<span class="ruby-identifier">name</span>, <span class="ruby-identifier">distance</span>]
    <span class="ruby-keyword">end</span>.<span class="ruby-identifier">compact</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">matches</span> = <span class="ruby-keyword">if</span> <span class="ruby-identifier">matches</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">type</span> <span class="ruby-operator">!=</span> <span class="ruby-value">:prerelease</span>
    <span class="ruby-identifier">suggest_gems_from_name</span> <span class="ruby-identifier">gem_name</span>, <span class="ruby-value">:prerelease</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">matches</span>.<span class="ruby-identifier">uniq</span>.<span class="ruby-identifier">sort_by</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">_name</span>, <span class="ruby-identifier">dist</span><span class="ruby-operator">|</span> <span class="ruby-identifier">dist</span> }
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">matches</span>.<span class="ruby-identifier">map</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">name</span>, <span class="ruby-identifier">_dist</span><span class="ruby-operator">|</span> <span class="ruby-identifier">name</span> }.<span class="ruby-identifier">uniq</span>.<span class="ruby-identifier">first</span>(<span class="ruby-identifier">num_results</span>)
<span class="ruby-keyword">end</span></pre>
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